Too bad this is a one-shot; it would make a good first chapter for an AU.

Very nice. I love the characterization of Lily, as a flawed woman as opposed to a crusading girl.

This is a lovely story! Are you going to turn it into a wonderful epic, where Severus shakes off his evil Slytherin friends, sees the light and generally has a wonderful life? Please do! I know there are a few of them around (I even wrote a sequel to the idea, starring Severus and Lily Snape's son), but you write well enough, and the idea is believable enough to continue, and I hope you do! Don't give up!

I've always been curious about the Sev/Lily relationship and I loved your take on it. I enjoyed the rise and fall of their argument and their truce with the little brush of the lips. :-) Lovely.